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- mass= 1.672623 x 10-24 g
- relative mass= 1.007 atomic mass units (u)
- relative mass = 0.0005 u ( not usually counted because they are so light)
- main number
- order in periodic table
- not weight!
- is the number of protons and electrons
protons + neutrons
atoms of same element, but different mass number
if you change the mass number you change...
the number of neutrons
numbers in the periodic table in terms of mass are not....
exact they are averages
finding atomic weight with isotopes
(% of isotope 1)(mass) + (% of isotope 2)(mass)= average weight
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